Method of forming hermetic seams in sheet metal.



No. 813,439. f Y V @MENTRE APR. 24, 190e.

` Q.. H m 1 MBTHGD or Foawm Ham/m10 SRAM@ m SHEET METAL.

APPLIOATKON FILED MAR.L3,19G5.

yVTNE'SSES Fipeeceton of Lettere Patent.

etentel April P3015,

pplicntien filed lfarch 18,1905. Serial No. 250,802.

To @ZZ whom t may concern:

Be it known that l, @SCAR Hnlnnonr, a

subject of the King oi Greet Britain, residing in the {zit}T o London,England, have invented certain .new and useful improvements in Methodsof' Forming a. Herinetic Seem in Sheet Metal ;b and l do hereby.rdernere the iollowing to be a full, clear, and exact description oi theinvention, such es will enable others skilled in the art to which iteppen tnins to make and use the same, reference beingl had totheaccompanying .lrstwings, and to letters of reference mei-hed thereon,which iorm a part oi this specification.

My invention. relates to folded or lock' seems for sheet-metal vessels gand it consists in e novel method oi forming :1 hermetic joi'nt 'or scumin such wherebyr the minimum layers only nre necessary, so that metal issaved, weer and teur on the Atorining inechincryreduced, and the outputcorrespondin gly increased.

My invention is full),v illustrated 'in the eccoinpenying drawings, inwhich i Figure il" is e transverse sectional 'View of the seein as itstands-after the iirst step of the operation of forming the sanne. Fig.2 is a transverse sectional View of the seem after the saine has beenlongitudinally grooved,

und Fig. 3 a transverse sectional view of .the seein when. comple ted.

The .seein is shown in the drawings as the' side seein. of e con; but itshould be under stood that in v invention is applicable in cer-- tainaspects thereof to other seems.

ev in the drawings 'is e ilenge formed, preferably, et right ongles toone edge portion. oi the sheet which furnis the body of `the een, and be. rebond formed, preferably, at right ongles to the opposite edgeportion oi said sheetA As showin this flange and rebond 'preferablyproiect inwardly, the Harige being received by the rebend L. The flangeand rebend being thus esseinbled by e suitable ineens acti-ug todisplace the nietel oi" the parts ,longitinlinelly and for a portiononly of the Width thereof, n bend is formed et c in thern, which has theetl'ect oi' producing e groove d in one side o'l each fold e f g and ebeed l@ on the other side thereof, beads end grooves ii'ting into eachother'. The thus joined end i'orrned flange a and rebond 5 are then bentover es one 'to end against the adjoininff'fece ot 'the pt rtion of themetal from which the flange e immediately projects, the layers or *foldse, j, and 'g and the part .oi the sheet immediate y adjacent flange a.beine' cornpectly compressed together as tightly possible with the Viewto `avoiding the torinetion of all in terstioes or les; leopenin gs ofwhata l ever naturef' Thereupon the portion of the sheet which .is'immediately adjacent the flange (L an d which directly coincides withor is opposedtothe layers e, f, and q lis grooved on the outside incoineidencewith the groove d, thus forming ahead. on the inside of said`portion which fits into andV is coincident. with the groove d o't' thelayer e. The growing whereby the bead j is formed is above described esoccurring after the compression oi the several layers; but it should beunder stood that the compressing and grooving 'tney be accomplished inboth one end the seine operation.

Formed in the manner above described, ay senm is produced in Wh.l -h theminimum t... rnetal is necessary and which will be found to beperiectlgT hermetic. By `gliephiciiig the metal of the assembled flangeit and. rebend in; the manner stated, so as to produce eoinciilinfygrooves and heads, when the esseniM bled ilange and rebend are bent overin to the position shown in Fi 3 there is e certain w ping together ofthe surfaces oi the layers -Wise exist. The grooving which forms thebead j, moreover, results in a further 'rc strictcd compacting endintimate conteetingvv of the layers ef g in that restricted portionthereof delineated by the previous growing of sai d levers. f

Heving thus 'fully described in "'inventloin what I claim es new, anddesire to secure by Letters Patent, isf

l. The method of 'forming o hermetic senin in sheet metal which consistsin forming :i re bend in one edge portion and inserting the other edgeportieri therein, groei/ing the lann nated body thus. producedlongitudinally so es to produce intertitting grooves end be. in thelayers thereof, and then bending tm. thus grooved laminated bodj7 overout oi the plane of initial assemblage oi" seid edge por. tions,substantially as described.

2.' The method of forming a. hermetic seein l Dvithe portion of themetal in sheet metal which consists in forming a' `rebend in one edgeportion and inserting the Otlher edge portion therein, grooving and i cpressing the llaminated body thus proddxbd longitudinall soas to produceinter'- tting grooves and eads in the layers thereof, and then bendingthe thus grooved laniilDated body over out of the plane of initial assemblage of said edge portions, substantially as deseribed.`

3. The method of forming-a hermetic seani in sheet metal Which consistsin forming a rebend in one edge portion and inserting the other edgeportion therein, grooving and compressing the laminated body thusproduced longitudinally so as to produce interfitting grooves and beadsin the layers there.- of, and then bending the thus grooved laniinatedbody over and compressing it against adjacent one of said edge `ortons,substantially as described.

4. ilhe method ol' forming a hermetic seani in sheet bend in other edgeportion therein, grooving and metal which consists in forming a rez' oneedge portion and inserting thc I duced longitudinally so as to produceinterl fitting grooves and beads in the layers therebody over againstthe portion of the metal l adjacent one of said edge portions, and thenlgrooving said portion coincident with the groove of said groovedlaminated body, sub-` l stantially as described.

5. The method of forming a hermetic joint in a sheet-metal look-seamhaving longitudinal beads on certain of its layers which consists incompressing the layers of the seain to cause thc bea-ds to intimatelycontact with adjacent layers, and thcn bending the seam, I compressed,over around an axis parallel with the seani. whereby to ca use the beadsto l wipe against the adjacent layers, substani tially as described.

i In testimony that I claim the foregoing I ,l have hereuntoset my handthis 24th day of l February, 1905.

OSCAR HEINDORI".

i Witnesses :Y WM. l). BELL, l JoiiN W. S'rEWAnL.

of, then bending the thus grooved laminatedl

